根据选择项过滤GridView

    <div>
            <asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True">
                <asp:ListItem Text="Sunny" Value="Sunny"></asp:ListItem>
                <asp:ListItem Text="Mike" Value="Mike"></asp:ListItem>   
                <asp:ListItem Text="Jakes" Value="Ken"></asp:ListItem>
                <asp:ListItem Text="Ken" Value="Ken"></asp:ListItem>
            </asp:CheckBoxList>
            <hr />
            <br />
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
                <Columns>
                    <asp:TemplateField HeaderText="ID">
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server" Text=‘<%#Eval("ID") %>‘></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Name">
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server" Text=‘<%#Eval("Name") %>‘></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="City">
                        <ItemTemplate>
                            <asp:Label ID="Label1" runat="server" Text=‘<%#Eval("City") %>‘></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>
        </div>

protected void Page_Load(object sender, EventArgs e)
        {
            string strwhere = "";
            foreach (ListItem item in CheckBoxList1.Items)
            {
                if (item.Selected)
                {
                    strwhere += "‘" + item.Value.ToString() + "‘,";
                }
            }
            BindGridView(strwhere);
        }
        public void BindGridView(string Names)
        {
            DataTable dt=new DataTable();
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DemosDatabaseConnectionString"].ConnectionString))
            {
                conn.Open();
                if (Names.Length <= 0)
                {
                    string sql = "select * from Customers";
                    SqlDataAdapter sda = new SqlDataAdapter(sql,conn);
                    sda.Fill(dt);

                    GridView1.DataSource = dt;
                    GridView1.DataBind();
                }
                else
                {                    
                    string sql = "select * from Customers where Name in (" + Names.Substring(0, Names.Length - 1) + ")";
                    SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
                    sda.Fill(dt);

                    GridView1.DataSource = dt;
                    GridView1.DataBind();
                }
            }
          
        }